[PATCH] build-many-glibcs: Add a RISC-V config with most of the B extensions

[Florian Weimer]

* Palmer Dabbelt:

> +        self.add_config(arch='riscv64',
> +                        os_name='linux-gnu',
> +                        variant='rv64imafdcb-lp64d',
> +                        gcc_cfg=['--with-arch=rv64imafdc_zba_zbb_zbs', '--with-abi=lp64d',
> +                                 '--disable-multilib'])

I doubt we need a separate GCC configuration, you should be able to use
the existing compiler for that and just change the glibc build flags.

I expect we need some sort of version check because these flags are
rather recent, right?  To what extend do they actually impact code
generation for glibc?

Thanks,
Florian